|Publication number||US6988329 B2|
|Application number||US 11/071,728|
|Publication date||Jan 24, 2006|
|Filing date||Mar 4, 2005|
|Priority date||Jul 2, 2002|
|Also published as||CA2490408A1, CA2490408C, EP1534095A1, EP1534095A4, US6785985, US7047670, US7152625, US7337560, US7340851, US7721465, US7735241, US8151489, US20040003515, US20040003517, US20040211084, US20050144810, US20060048415, US20060112593, US20060162186, US20080098620, US20100192410, WO2004004503A1|
|Publication number||071728, 11071728, US 6988329 B2, US 6988329B2, US-B2-6988329, US6988329 B2, US6988329B2|
|Inventors||William Marvin, Paul M. Davis, Geoff Swales, Paul E. Litchfield|
|Original Assignee||Reebok International Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (112), Non-Patent Citations (6), Referenced by (14), Classifications (24), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is continuation of Ser. No. 10/851,088 filed May 24, 2004, which is a continuation of Ser. No. 10/186,717 filed on Jul. 2, 2002, now U.S. Pat. No. 6,785,985.
1. Field of the Invention
This invention relates to footwear, and more particularly to an athletic shoe having an inflatable bladder.
2. Background Art
Athletic footwear must provide stable and comfortable support for the body while subject to various types of stress. It is important that the shoe be comfortable and provide support during various foot movements associated with athletic activity.
Articles of footwear typically include an upper and a sole, and are sold in a variety of sizes according to the length and width of the foot. However, even feet of similar length do not have the same geometry. Therefore, a conventional upper must be adjustable to provide support to various foot contours. Many different products and designs have focused on the need for adjustable upper support. For example, the upper may include an ankle portion which encompasses a portion of the ankle region of the foot and thereby provides support thereto.
In addition, it is well known to adjust the size of a shoe through lacing or through one or more straps reaching across the throat of a typical shoe. Lacing alone, however, suffers from several disadvantages, for example, when the shoe laces or strap is drawn too tightly, the fastening system can cause pressure on the instep of the foot. Such localized pressure is uncomfortable to the wearer and can make it difficult for the shoe to be worn for prolonged periods of time. Furthermore, while lacing allows the upper of the shoe to be adjustable to accommodate varying foot and ankle configurations, it does not mold the shoe to the contour of individual feet. Moreover, there are areas of the foot which are not supported by the upper, due to the irregular contour of the foot. The ski boot industry has often resorted to using inflatable insertable devices to improve the fit of the boots without the pressure caused by lacing.
One of the problems associated with shoes has always been striking a balance between support and cushioning. Throughout the course of an average day, the feet and legs of an individual are subjected to substantial impact forces. Running, jumping, walking and even standing exert forces upon the feet and legs of an individual which can lead to soreness, fatigue, and injury.
The human foot is a complex and remarkable piece of machinery, capable of withstanding and dissipating many impact forces. The natural padding of fat at the heel and forefoot, as well as the flexibility of the arch, help to cushion the foot. An athlete's stride is partly the result of energy which is stored in the flexible tissues of the foot. For example, during a typical walking or running stride, the achilleas tendon and the arch stretch and contract, storing energy in the tendons and ligaments. When the restrictive pressure on these elements is released, the stored energy is also released, thereby reducing the burden which must be assumed by the muscles.
Although the human foot possesses natural cushioning and rebounding characteristics, the foot alone is incapable of effectively overcoming many of the forces encountered during athletic activity. Unless an individual is wearing shoes which provide proper cushioning and support, the soreness and fatigue associated with athletic activity is more acute, and its onset accelerated. This results in discomfort for the wearer which diminishes the incentive for further athletic activity. Equally important, inadequately cushioned footwear can lead to injuries such as blisters, muscle, tendon and ligament damage, and bone stress fractures. Improper footwear can also lead to other ailments, including back pain.
In light of the above, numerous attempts have been made over the years to incorporate into a shoe a means for providing improved cushioning and resiliency to the shoe. For example, attempts have been made to enhance the natural elasticity and energy return of the foot with foams such as EVA, which tend to break down over time and lose their resiliency, or with fluid-filled inserts. Fluid filled devices attempt to enhance cushioning and energy return by containing pressurized fluid disposed adjacent the heel and forefoot areas of a shoe. Several overriding problems exist with these devices.
One of these problems is that often fluid filled devices are not adjustable for physiological variances between people and the variety of activities for which athletic shoes are warn. It has been known to adjust fluids in the sole of footwear, such as in U.S. Pat. No. 4,610,099 to Signori. However, under foot devices, while providing cushioning to the sole, typically do not aid in support for the sides, top and back of the foot. Attempts to cushion the upper and sole of a shoe with air have resulted in products that are either ineffective or, because of the construction techniques used, are too heavy and cumbersome to be used for a running shoe.
For example, U.S. Pat. No. 5,113,599 discloses an article of footwear having an inflatable bladder under the foot as well as around the sides and back of the foot. In conventional underfoot cushioning systems, when the heel contacts the ground during the gait cycle, fluid is transferred from the heel area of the foot and displaced to the forefoot area of the foot, causing the pressure in the forefoot area to increase. Because the underfoot portion of an inflatable bladder is typically separate from the portions of an inflatable bladder along the sides and top of the foot, downward pressure in the heel of a conventional cushioning device has no effect on the cushioning surrounding the sides and heel of a foot.
Conventional inflatable shoe inserts are also designed to be used in conjunction with a conventional shoe upper. A shoe with this type of design can be quite expensive because it requires all the materials of the upper and the additional materials of the inflatable insert. Often the inflatable inserts also add bulk to the shoe because they require a system of complex tubing between the inflation mechanism and the inflatable bladder. With the presence of an upper to completely surround the foot, there is no need for the inflation inserts to completely surround the foot. Conventional inserts may only support certain regions of the foot.
Most conventional inflatable shoes include either a hand-held inflation mechanism, e.g., that described in Brazilian Patent No. 8305004 to Signori, or an on-board inflation mechanism which is used to selectively inflate only a portion of a shoe. Other inflatable shoes are pre-inflated at the factory. Whether inflated at the factory or inflated by the user, there is a problem with diffusion of air out of the shoe. In the case of shoes inflated at the factory, the problem of diffusion has been partially solved by utilizing a large molecule gas as the fluid for inflating the shoe. While the large molecule gas does not diffuse at the same rate as air, the gas is more expensive which increases the costs of the shoe, and a user is not capable of varying the amount of pressure in the shoe to his individual preferences.
Accordingly, what is needed is a shoe which includes one continuously fluidly interconnected inflatable bladder, wherein fluid may flow between the underside of the foot to the medial and lateral sides of the foot without the need for complex tubing. The footwear must be securely fitted and fastened to the foot of the wearer, whereby a comfortable but secure grip is assured around the ankle and around the instep of the wearer. Further, the bladder in the athletic shoe must be lightweight, inexpensive, self-contained, and easy to use. In addition, the shoe should be easily constructed with minimum required stitching.
The present invention is generally an article of footwear having a sole, and an upper. The upper has an outer surface and an inner surface. At least a portion of either the outer surface or the inner surface or both is formed from an inflatable bladder. The bladder is inflated by an inflation mechanism. The inflation mechanism is located in such a manner that the downward pressure of a user's foot causes the operation of the inflation mechanism. The bladder is made from two sheets of urethane film which are welded together. Alternatively, the bladder can be formed from a laminate, such as a film and cloth laminate.
The inflatable bladder includes a sole compartment, a medial compartment, and a lateral compartment. The sole compartment extends under the foot of a wearer and is further divided into at least a first compartment and a second compartment. The first compartment is fluidly connected and adjacent to the medial compartment and the second compartment is fluidly connected to and adjacent the lateral compartment, such that the medial side and lateral side of the bladder are attached under the foot of the wearer. However, the first compartment and the second compartment are not directly fluidly connected and are separated by a periphery weld line. The first compartment and the second compartment are permanently attached under the foot, such as by the used of stitching in the margin of the bladder. Consequently, the bladder forms a continuous cushion running from one side of an inserted foot, under the foot, to a second side of the foot.
The bladder further includes an heel portion fluidly connected and adjacent to both the medial compartment and the lateral compartment. The heel portion is permanently attached to the sole compartment, such that the bladder forms a boot surrounding a heel of a foot when inserted into said shoe.
The first compartment generally includes an arch compartment, while the second compartment generally includes a heel compartment. The second compartment also includes a midfoot compartment, which may be fluidly connected to one of the heel compartment, the medial compartment or the lateral compartment. The second compartment further includes a forefoot compartment, which may also be fluidly connected to one of the midfoot compartment, the medral compartment or the lateral compartment.
In another embodiment, the first compartment is a forefoot compartment, and the second compartment includes a heel compartment and a midfoot compartment, such that the midfoot compartment may be fluidly connected to one or more of the heel compartment, the lateral compartment and the medial compartment.
The article of footwear may include a release valve, which communicates between said bladder and the ambient atmosphere. With the release valve, a user can reduce the amount of air in said bladder manually. Alternatively, the article of footwear may include a check valve, whereby the pressure in said bladder is automatically released. In another embodiment, a combination check valve and release valve may be used in the present invention. A combination check valve and release valve is made from a cap; a seating forming an air-tight seal with the cap; a check valve forming another air-tight seal with the seating. A downward pressure on the cap causes a separation between said seating and said cap releasing the airtight seal between the cap and the seating.
The underfoot inflation mechanism defines a hole which acts as a one-way valve to enable air to be introduced into said inflation mechanism. Generally, the inflation mechanism is located substantially under the heel of the foot and includes a foam insert to help maintain the volume of the inflation mechanism. More than one underfoot inflation mechanism may be used in the present invention. An underfoot inflation mechanism may be disposed within a cavity formed in the top surface of a foam midsole.
The foregoing and other features and advantages of the present invention will be apparent from the following, more particular description of a preferred embodiment of the invention, as illustrated in the accompanying drawings in which:
A preferred embodiment of the present invention is now described with reference to the Figures, in which like reference numerals are used to indicate identical or functionally similar elements. Also in the Figures, the left most digit of each reference numeral corresponds to the Figure in which the reference numeral first appears. While specific configurations and arrangements are discussed, it should be understood that this is done for illustrative purposes only. A person skilled in the relevant art will recognize that other configurations and arrangements can be used without departing from the spirit and scope of the invention. It will be apparent to a person skilled in the relevant art that this invention can also be employed in other applications.
A shoe for a right foot according to the present invention is shown generally at 100 in
In order for a wearer to customize the amount of air in the bladder at any time, bladder 130 is in communication with an inflation mechanism. In an embodiment shown in
A variety of different inflation mechanisms can be utilized in the present invention. The inflation mechanism may be, for example, a simple latex bulb which is physically attached to the shoe. Alternatively, the inflation mechanism may be a molded plastic chamber as shown in
Finally, as will be described with reference to
Preferably, the inflation mechanism is small, lightweight, and provides a sufficient volume of air such that only little effort is needed for adequate inflation. For example, U.S. Pat. No. 5,987,779, which is incorporated by reference, describes an inflation mechanism comprising a bulb (of various shapes) with a one-way check valve. When the bulb is compressed air within the bulb is forced into the desired region. As the bulb is released, the check valve opens because of the pressure void in the bulb, allowing ambient air to enter the bulb.
Another inflation mechanism, also described in U.S. Pat. No. 5,987,779, incorporated herein by reference, is a bulb having a hole which acts as a one-way valve. A finger can be placed over the hole in the bulb upon compression. Therefore, the air is not permitted to escape through the hole and is forced into the desired location. When the finger is removed, ambient air is allowed to enter through the hole. An inflation mechanism having collapsible walls in order to displace a greater volume of air may be preferred. A similar inflation mechanism may include a temporarily collapsible foam insert. This foam insert ensures that when the bulb is released, the bulb expands to the natural volume of the foam insert drawing in air to fill that volume. A preferred foam is a polyurethane or polyether foam, such as the 4.25–4.79 pound per cubic foot polyether polyurethane foam, part number FS-170-450TN, available from Woodbridge Foam Fabricating, 1120-T Judd Rd., Chattanooga, Tenn., 37406.
U.S. Pat. No. 6,287,225, incorporated herein by reference, describes another type of on-board inflation mechanism suitable for the present invention. One skilled in the art can appreciate that a variety of inflation mechanisms are suitable for the present invention. In addition, any inflation mechanism is appropriate for use with any embodiments of the present invention.
The inflation mechanism shown in
These inflation mechanisms all require a one-way valve be placed between the inflation mechanism and the bladder 130, so that once air enters the system it may not travel backwards into the inflation mechanism. Various types of one-way valves are suitable for use in conjunction with the various inflation mechanisms of the present invention. Preferably, the valve will be relatively small and flat for less bulkiness. U.S. Pat. No. 5,144,708 to Pekar, incorporated herein by reference, describes a valve suitable for the present invention. The patent describes a valve formed between thermoplastic sheets. The valve described in the Pekar patent allows for simple construction techniques to be used whereby the valve can be built into the system at the same time the bladder is being welded. One skilled in the art would understand that a variety of suitable valves are contemplated in the present invention.
The one-way valve provides a method to avoid over inflation of the system. In particular, if the pressure in the bladder is equal to the pressure exerted by the inflation mechanism, no additional air will be allowed to enter the system. In fact, when an equilibrium is reached between the pressure in the bladder and the pressure of the compressed inflation mechanism, the one-way valve which opens to allow air movement from the inflation mechanism to the bladder 130 may remain closed. Even if this valve does open, no more air will enter the system. Any one-way valve will provide a similar effect, as would be known to one skilled in the art. In addition, any one-way valve would be appropriate for use in any embodiments of the present invention.
One embodiment, as seen in
As an alternative, deflation valve 109 may also act as a check valve, or blow off valve, which will open when the pressure in bladder 130 is at or greater than a predetermined level. In each of these situations, bladder 130 will not inflate over a certain amount no matter how much a user attempts to inflate the shoe.
One type of check valve has a spring holding a movable seating member against an opening in the bladder. When the pressure from the air inside the bladder causes a greater pressure on the movable seating member in one direction than the spring causes in the other direction, the movable seating member moves away from the opening allowing air to escape the bladder. In addition, any other check valve is appropriate for use in the present invention, as would be apparent to one skilled in the art. For example, the VA-3497 Umbrella Check Valve (Part No. VL1682-104) made of Silicone VL1001M12 and commercially available from Vernay Laboratories, Inc. (Yellow Springs, Ohio, USA) may be a preferred check valve. Further, any check valve would be appropriate for use in any embodiment of the present invention.
In another embodiment, deflation valve 109 may be adjustable check valve wherein a user can adjust the pressure at which a valve is released. An adjustable check valve has the added benefit of being set to an individually preferred pressure rather than a factory predetermined pressure. An adjustable check valve may be similar to the spring and movable seating member configuration described in the preceding paragraph. To make it adjustable, however, the valve may have a mechanism for increasing or decreasing the tension in the spring, such that more or less air pressure, respectively, would be required to overcome the force of the spring and move the movable seating member away from the opening in the bladder. However, any type of adjustable check valve is appropriate for use in the present invention, as would be apparent to one skilled in the art, and any adjustable check valve would be appropriate for use in any embodiment of the present invention.
Bladder 130 may include more than one type of deflation valve 109. For example, bladder 130 may include both a check valve and a release valve. Alternatively, bladder 130 may contain a deflation valve 109 which is a combination release valve and check valve. This type of valve is described in detail below with respect to
In one embodiment, small perforations may be formed in the bladder to allow air to naturally diffuse through the bladder when a predetermined pressure is reached. The material used to make bladder 130 may be of a flexible material such that these perforations will generally remain closed. If the pressure in the bladder becomes greater than a predetermined pressure the force on the sides of the bladder will open the perforation and air will escape. When the pressure in bladder 130 is less than this predetermined pressure, air will escape very slowly, if at all, from these perforations. Any embodiment of a bladder of the present invention may also have these perforations for controlling the amount of air within the bladder.
Bladder 130 may be formed from an exterior layer or film and a coextensive interior layer or film. The bladder may be shaped in a variety of configuration, such as that shown for bladder 230 in
The interior layer is attached to the exterior layer along air-tight periphery weld lines 210. The periphery weld lines 210 attach the exterior layer to the interior layer and create a barrier to keep air between the layers. One example of a suitable method of attachment of the exterior layer to the interior layer is the application of high radio frequency (RF welding) to the edges of the first and second film. The exterior and interior layers may alternatively be heat welded or ultrasonic welded together or attached by any other air tight means. Interior weld lines 220 are also provided. These interior welded lines 220 are also formed by RF welding, heat welding, ultrasonic welding or by other suitable means, and form the compartments of the present invention discussed in detail below. The exterior layer and interior layer are only attached along the periphery weld lines 210 and the interior weld lines 220. Consequently, a pocket or bladder is formed which allows a fluid, such as air, another gas or a liquid, to be introduced between the exterior layer and the interior layer. The sheets are welded together along all the weld lines and then die cut to form the predetermined shape.
Since bladder 130 forms at least a portion of an exterior and/or an interior surface of upper 110, as seen in an embodiment of
Lateral compartment 256 is fluidly connected to heel compartment 260 which provides cushioning to the heel of the foot. Heel compartment 260 is also fluidly connected to connection junction 274 through passageway 280. Heel compartment 260 is fluidly interconnected to midfoot compartment 262 and forefoot compartment 260.
As shown in
The bladder shown in
In a preferred embodiment, bladder 230 may include welds 270, such as those shown in forefoot compartment 264, heel compartment 260 and arch compartment 252. Welds 270 are used to control the thickness of the bladder when the bladder is in its filled configuration (e.g., air has been pumped into the bladder). Welds 270 are also formed by RF welding, heat welding, ultrasonic welding or by other suitable means. In regions of the bladder where it is desirable to have bladder 230 inflated to a minimal thickness, the density of circular welds 270 may be greater than the areas where it is permissible or desirable for bladder 130 to be inflated to a greater thickness. These welds may be circular or any other geometry, such as triangular, oval or square, provided that they are shaped to limit and control the inflation dimensions of the bladder of the present invention.
As shown in
Also, as an alternative, heel compartment 308 may include a collapsible foam insert generally equivalent to the volume of heel compartment 308. The heel of the foot compressed the foam insert and heel compartment 308 in a typical gait cycle. As the heel is released, the foam insert expands to its original shape expanding the volume of the heel compartment 308 and allowing air to enter with the expansion of the heel compartment 308. A further example of a heel compartment comprising a foam insert is describe in detail below with respect to
Lateral compartment 356 is further fluidly connected to midfoot compartment 362 through passageway 322, and forefoot compartment 364 is fluidly connected to lateral compartment 356 through one-way valve 380.
Lateral compartment 356 is fluidly connected to lateral heel compartment 357 through fluid passageway 370. Lateral heel compartment 357 is fluidly connected to medial heel compartment 359 via-fluid connection junction 358, providing support around the heel portion 108 of shoe 100. Medial heel compartment 359 is fluidly connected to medial compartment 354 through fluid passageways 372 and 374. Medial compartment 354 is also fluidly connected to arch compartment 352.
Consequently, as a foot moves through a typical gait cycle, the pressure caused by the foot to the various compartments located under the foot forces the air into the various other fluidly connected parts of the bladder to provide added support around the medial side, lateral side and heel of the foot.
The embodiment described in
In other embodiments, bladder 330 of the present invention may include one or more manually operated inflation mechanisms located on the tongue of the shoe, near the heel of the shoe, on a lateral or medial side of the shoe, or anywhere else on the shoe as would be apparent to one skilled in the relevant art.
In an embodiment as shown in
Stitching is only one method for connecting these portions of the bladder. Alternatively, they may be adhered by glueing, bonding, RF welding, heat welding, ultrasonic welding, or another other method known to one skilled in the art.
Each of lateral compartment 554 and medial compartment 556 may have pockets formed from internal weld lines which are not fluidly connected to the rest of the compartment. Lateral pocket 532 is located within lateral compartment 554 and medial pocket 534 is located within medial compartment 556. These pockets are pre-inflated and are not part of the adjustable inflation system of the rest of the bladder. Further, bladder 530 comprises a third pocket 528. This third pocket provides support under and along the lateral side of the foot and in heel area 108. Similarly, a fourth pocket 526 provides support to heel area 108. Pockets 528 and 526 may in fact not be inflated. Instead, the two layers remain flat against one another. The weld lines surrounding pockets 528 and 526 keep the area separated from the inflated bladder without the need to weld together the sheets of film in the interior of pockets 528 and 526. Alternatively, lateral pockets 532 and medial pocket 534 could be removed leaving openings in the bladder at the locations designated as 532 and 534.
Bladder 530 may include welds 270, such as those shown in forefoot compartment 564 and midfoot compartment 562. Welds 270 may be of any shape provided that they limit and control the inflation dimensions of the bladder of the present invention. For example, elongated welds 540 can be found in forefoot compartment 564, lateral compartment 554 and medial compartment 540. Elongated welds 540 also define and limit the inflation dimensions of bladder 530.
Any inflation mechanism may be used as described for other embodiments of the present invention. Preferred, however, is the use of heel compartment 508 as an inflation mechanism. As can be seen in
Further, a shoe with an underfoot inflation mechanism may comprise a sole with an indented recess, or cavity, (not shown) substantially adjacent to the inflation mechanism and substantially the shape of the inflation mechanism. When the shoe is constructed, the inflation mechanism is inserted into the indented recess. During a typical gait cycle, the inflation mechanism is compressed between the indented recess and the foot such that the foot may sink into the indented recess. The indented recess may be located in either an outsole or a midsole portion of the sole.
Bladder 530 may utilize perforations or the one-way valve as a technique for limiting the about of pressure build-up. Alternatively, deflation valve 109 may be a release valve, check valve, a combination check valve and release valve (see below), or an adjustable check valve. Further more than one type of deflation valve 109 may be used.
In an embodiment as shown in
Stitching is only one method for constructing the bladder. Alternatively, periphery weld lines may be adhered by glueing, bonding, RF welding, heat welding, ultrasonic welding, or another other method known to one skilled in the art.
As discussed above, the present invention may include a combination check valve and release valve. This combination check valve and release valve is depicted in
An assembled combination release valve and check valve 701 is shown in
When the air pressure underneath the umbrella shape, and therefore the pressure in the bladder of the present invention, reaches a predetermined pressure, thin flap 718 is deformed and lifted off of the sleeve 704. Air is then allowed to escape through holes 716 in the surface portion 738 of cap 710. Dotted line 728 shows the route of air through the release valve portion of combination release valve and check valve 701. When the air pressure in the bladder and under the umbrella becomes less than the predetermined pressure, the thin flap 718 returns to its natural shape an again creating a seal against sleeve 704. The preferred umbrella valve 708, commercially available as VA-3497 Umbrella Check Valve (Part No. VL1682-104) from Vernay Laboratories, Inc. (Yellow Springs, Ohio, USA), typically deforms when the pressure in the bladder is around 5 pounds per square inch. Any other type of umbrella valve, however, would be suitable in the combination check valve and release valve of the present invention, as would be clear to one skilled in the art.
Spring 702, as seen in
In order to avoid a finger or thumb covering the holes located on the top of cap 710 and preventing the air from escaping through holes 716, an embodiment may include an extension or wall sticking out from the surface portion 738 of cap 710. For example, one embodiment may have a ring-shaped wall (not shown) outside of the holes 716. The ring-shaped wall further has holes in the sides of the wall, such that when a finger or thumb is placed on the ring-shaped wall, the wall pushes down on the cap 710 rather than the finger or thumb. The air that escapes through holes 716 is still trapped by the finger or thumb from the top, but can escape through the holes in the sides of the ring-shaped wall. Another embodiment may have an extension sticking out from the center of surface portion 738. When the extension is depressed, the cap 710 depresses without covering the holes 716. An additional cap may be placed on top of the extension or wall to provide a bigger surface for a finger or thumb to depress the extension or wall. Consequently, the air is allowed to escape from a gap between cap 710 and the additional cap.
While the invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that they have been presented by way of example only, and not limitation, and various changes in form and details can be made therein without departing from the spirit and scope of the invention. For example, a bladder of the present invention may be pre-inflated at the factory. A bladder of this type would not require an inflation mechanism or a deflation valve.
Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents. Additionally, all references cited herein, including issued U.S. patents, or any other references, are each entirely incorporated by reference herein, including all data, tables, figures, and text presented in the cited references.
The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying knowledge within the skill of the art (including the contents of the references cited herein), readily modify and/or adapt for various applications such specific embodiments, without undue experimentation, without departing from the general concept of the present invention. Therefore, such adaptations and modifications are intended to be within the meaning and range of equivalents of the disclosed embodiments, based on the teaching and guidance presented herein. It is to be understood that the phraseology or terminology herein is for the purpose of description and not of limitation, such that the terminology or phraseology of the present specification is to be interpreted by the skilled artisan in light of the teachings and guidance presented herein, in combination with the knowledge of one of ordinary skill in the art.
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|1||Innovations in Cycling, Inc., Interbike Buyer Official Show Guide, 10<SUP>th </SUP>Ann. Interbike 1991 Int'l. Bicycle Expo.|
|2||Mega MicroBlast CO<SUB>2 </SUB>Air Dispenser, Date Unknown.|
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|6||ZONIC Product Descriptions, date unknown.|
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|US7694438||Dec 13, 2006||Apr 13, 2010||Reebok International Ltd.||Article of footwear having an adjustable ride|
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|US8256141||Apr 7, 2009||Sep 4, 2012||Reebok International Limited||Article of footwear having an adjustable ride|
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|US8636678||Jul 1, 2008||Jan 28, 2014||Covidien Lp||Inflatable member for compression foot cuff|
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|US8857076||Apr 6, 2011||Oct 14, 2014||Nike, Inc.||Article of footwear with an adaptive fluid system|
|US8858200||Mar 12, 2013||Oct 14, 2014||Reebok International Limited||Pump and valve combination for an article of footwear incorporating an inflatable bladder|
|US8919013||Apr 26, 2012||Dec 30, 2014||Reebok International Limited||Article of footwear having an adjustable ride|
|US9060564||Apr 6, 2011||Jun 23, 2015||Nike, Inc.||Adjustable multi-bladder system for an article of footwear|
|U.S. Classification||36/45, 36/29, 36/88|
|International Classification||A43B7/14, F16K15/20, A43B23/02, A43B7/32, A43C11/00, A43B23/07, A43B23/00, A43B13/20, A43B5/00|
|Cooperative Classification||A43B13/203, A43B13/20, A43B23/07, Y10T137/789, Y10T137/87394, A43C11/00, F16K15/202|
|European Classification||A43B13/20, F16K15/20F, A43C11/00, A43B13/20P, A43B23/07|
|Jun 5, 2009||FPAY||Fee payment|
Year of fee payment: 4
|Jun 26, 2013||FPAY||Fee payment|
Year of fee payment: 8